Improvement in tube-expanders



UNIT D STATES PATENT OFFICE.

ELI W.'FLAGG, OF BATTLECREEK, MICHIGAN, ASSIGNOR 0F ONE-HALF HIS RIGHTTO GEORGE 1 EDMONDS AND WILLIAM H. FLAGG, OF SAME PLACE.

IMPROVEMENT m TUBE-EXPANDERS.

Specification forming part'of Letters Patent No. 173,610, dated February15,1876; application filed July 26, 1875. Y

To all whom it may concern:

Be it known that I, ELI W. ELAGG, of Battie Creek, in the county ofCalhoun and in the State of Michigan, have invented certain new anduseful Improvements in Tube-Expanders;

. and I do hereby declare thatthe following is a full, clear, and exactdescriptionthereof, reference being bad to the accompanying drawing, andto the letters of reference marked thereon, making a part of thisspecification:

My invention relates to devices for expanding flues; and it consists ofa conical plug surrounded by a sleeve, and having a screwmandrel passingthrough the same, and the sleeve provided with conical rollers, as willbe hereinafter more fully setforth.

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the annexed drawing, in which-Figure l is a side-elevation of my tube-exp'mder, with conical rollers.Fig. 2 is a longitudinal section of the same.

Arepresents a mandrel, provided with screwth'reads a for a certainportion of its length, and the end of the mandrel is turned down,leaving a smooth, round portion, b, below the threads at, and below saidround portion b are made other threads, d. B represents a plug, theupper end of which is pol ygonal-shaped, to

v receive a Wrench for turning the same, while the lower end is madeconical, as shown.

This plug is bored longitudinally in the center, and formed with femalescrew'threads, for the portion c of the mandril to screw therein. 0represents a sleeve to be placed over the conical plug B, the interiorof said sleeve being made to correspond with the shape of the plug andits exterior cylindrical. In the sleeve 0 are made wedge-shaped'slots,having its sides made concave, for the reception of conical rollers D D,which lie against the sides of the conical plug and are held in thesleeve by a plate or cap, E, fastened tofthe lower end of the sleeve byscrews, saidcap fitting around the smooth part b of the mandrel. On thethreads at of the mandrel are placed nuts G G, as shown.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is'

The combination of the conical plug, with the female screw-threads inits center bore, the mandrel, with screw-threads, the sleeve 0, conicalrollers D, and the plate or cap E, all constructed substantially as andfor the purposes herein set forth.

-In testimony that I claim the foregoing I have hereunto set my handthis 26th day of May, 1875.

ELI W. FLAGG.

Witnesses:

M. ME'IGALF, DAVID H. METGALF.

